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kno3 vs potassium sulfate for plant color/ adding ammonium?

I remember but can't find something someone mentioned
something about how Rotala macrandra is redder with
potassium sulfate than with kno3.  In my tank, I
always add the sulfate form, but the plants are not as
red when I add kno3 as well.  Why exactly is this?  

That said, and knowing that aquatic plants prefer
ammonium to nitrates, would we get better growth and
color adding VERY weak additions of ammonium or
ammonia daily?  I cringe as I write this, but I think
it may have some merits.  

Thoughts?  Cavan, in Pittsburgh  

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